[/
  Copyright 2011 - 2020 John Maddock.
  Copyright 2013 - 2019 Paul A. Bristow.
  Copyright 2013 Christopher Kormanyos.

  Distributed under the Boost Software License, Version 1.0.
  (See accompanying file LICENSE_1_0.txt or copy at
  http://www.boost.org/LICENSE_1_0.txt).
]

[section:tom_int tom_int]

`#include <nil/crypto3/multiprecision/tommath.hpp>`

   namespace boost{ namespace multiprecision{

   class tommath_int;

   typedef number<tommath_int >         tom_int;

   }} // namespaces

The `tommath_int` back-end is used via the typedef `nil::crypto3::multiprecision::tom_int`.  It acts as a thin wrapper around the [tommath] `tom_int`
to provide an integer type that is a drop-in replacement for the native C++ integer types, but with unlimited precision.

Things you should know when using this type:

* Default constructed objects have the value zero (this is [tommath]'s default behavior).
* Although `tom_int` is mostly a drop in replacement for the integer __fundamental_types, it should be noted that it is a
rather strange beast as it's a signed type that is not a 2's complement type.  As a result the bitwise operations
`| & ^` will throw a `std::runtime_error` exception if either of the arguments is negative.  Similarly the complement
operator`~` is deliberately not implemented for this type.
* Formatted IO for this type does not support octal or hexadecimal notation for negative values,
as a result performing formatted output on this type when the argument is negative and either of the flags
`std::ios_base::oct` or `std::ios_base::hex` are set, will result in a `std::runtime_error` will be thrown.
* Conversion from a string results in a `std::runtime_error` being thrown if the string can not be interpreted
as a valid integer.
* Division by zero results in a `std::overflow_error` being thrown.

[h5 Example:]

[tommath_eg]

[endsect] [/section:tom_int tom_int]
